[NTP Client] Put dismissing sections behind a flag

components/ntp_snippets/features.cc

Index: components/ntp_snippets/features.cc
diff --git a/components/ntp_snippets/features.cc b/components/ntp_snippets/features.cc
index 7baf3d7bc0ac482e80ff664f7633c940173b4cbb..16ea35fb72137ae777c4f7ff312ddbe3b5298171 100644
--- a/components/ntp_snippets/features.cc
+++ b/components/ntp_snippets/features.cc
@@ -30,6 +30,9 @@ const base::Feature kPhysicalWebPageSuggestionsFeature{
 const base::Feature kContentSuggestionsFeature{
     "NTPSnippets", base::FEATURE_ENABLED_BY_DEFAULT};
 
+const base::Feature kSectionDismissalFeature{
+    "NTPSuggestionsSectionDismissal", base::FEATURE_DISABLED_BY_DEFAULT};
+
 const base::Feature kForeignSessionsSuggestionsFeature{
     "NTPForeignSessionsSuggestions", base::FEATURE_DISABLED_BY_DEFAULT};